He was an okay battery commander.是什么意思？

He was an okay battery commander.

他是炮兵连一个很不错的指挥官。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

okay

n. 认可，同意；v. 赞成或同意，批准；int. 行，用以表达准许或同意之意；adj. 可以，不错；

例句
Is it okay if I come by myself?...
我一个人来行吗？

battery

n. [电]电池，蓄电池，[军]炮台，炮位，一组，[法]殴打；

例句
Free range and battery eggs, boiled for four minutes, were hard to tell apart.
柴鸡蛋和笼养鸡蛋在煮过4分钟之后很难区分。

commander

n. 指挥官，司令官，[海]中校，副舰长，木

例句
Giving them an airy wave of his hand, the Commander sailed past.
这位海军中校随意地朝他们挥挥手便扬帆而过。